A beluga whale stages a performance with a breeder during a "dance show" for visitors at the Harbin Polarland theme park in Harbin, capital of northeast China's Heilongjiang Province, July 5, 2013. As the summer vacation comes, many students are attracted to the theme park to watch the performance by the whales.

A beluga whale stages a performance with a breeder during a "dance show" for visitors at the Harbin Polarland theme park in Harbin, capital of northeast China's Heilongjiang Province, July 5, 2013. As the summer vacation comes, many students are attracted to the theme park to watch the performance by the whales.

Beluga whales stage a performance with breeders during a "dance show" for visitors at the Harbin Polarland theme park in Harbin, capital of northeast China's Heilongjiang Province, July 5, 2013. As the summer vacation comes, many students are attracted to the theme park to watch the performance by the whales.

Beluga whales stage a performance during a "dance show" for visitors at the Harbin Polarland theme park in Harbin, capital of northeast China's Heilongjiang Province, July 5, 2013. As the summer vacation comes, many students are attracted to the theme park to watch the performance by the whales.

Beluga whales stage a performance with breeders during a "dance show" for visitors at the Harbin Polarland theme park in Harbin, capital of northeast China's Heilongjiang Province, July 5, 2013. As the summer vacation comes, many students are attracted to the theme park to watch the performance by the whales.